当代军语快译通

A ssault aircraft——a pow ered air-craft that m oves assault troops and/or cargo intoan objective area.突击机用来将突击力量或物资输送到目标区域内的强力飞机。A ssault area——in am phibious operations,thatarea that includes the beach area,the boat lanes,thelines of departure,the landing ship areas,the transportareas,and the fire support areas in the im m ediate vicinityof the boat lanes.突击区域在两栖作战中,包括海岸地域,航线,出发线,停泊海区,换乘区域,以及航线临近海域的火力支持区域在内的区域的总…     

Dynamic response of UHMWPE plates under combined shock and fragment loading

Ultra-high molecular weight polyethylene(UHMWPE) fiber composite has been extensively used to construct lightweight protective structures against ballistic impacts, yet little is known about its performance when subjected to combined blast and fragment impacts. Built upon a recently developed laboratory-scale experimental technique to generate simulated combined loading through the impact of a fragment-foam composite projectile launched from a light gas gun, the dynamic responses of fullyclamped...     

自旋稳定动能拦截器轨控发动机推力控制

提出了大气层外自旋稳定式动能拦截器的一种典型轨控发动机阵列布局.在分析小发动机工作的各种约束条件的基础上,推导了发动机推力角度、推力大小和冲量效率的计算公式,提出了发动机工作的控制方法.在各种初始条件下进行拦截仿真,所得的脱靶量均在0.3 m以内,可视为直接碰撞命中目标.同时通过仿真分析了冲量效率与自旋速度、发动机工作时间、每圈发动机个数的关系.     

长五B大推力氢氧发动机可靠性试车成功

<正>1月8日14时54分,由中国航天科技集团有限公司六院研制的长征五号B运载火箭大推力氢氧发动机顺利完成了一次型号可靠性试车,进一步验证大推力氢氧发动机的能力,为长征五号B运载火箭执行空间站任务奠定基础。此次试车时间为500秒,与发动机在火箭上的飞行时间一致。     

当代军语快译通

Area search——visual reconnaissance of limited or defined areas.地域侦查在规定或指定地域进行的目视侦查。Armament delivery recording——motion picture,still photography,an video recordings show-ing the delivery and impact of ordnance.This differsfrom reconnaissance imagery in that it records the act of deliv-ery and impact andnormally is done by the weapon sys-tem delivery the ordnance.Armament delivery recording is used primarily for evaluating strike effectiveness and for combat crew trainin…     

当代军语快译通

A ssum ed azim uth——The as-sum ption of azim uth origins as a field expedientuntil the required data are available.假定方位角在得到准确数据之前,为方便战场行动而假设的方位角。A ssum ed grid——A grid constructed using anarbitrary scale superim posed on a m ap;chart,or photo-graph for use in point designation w ithout regard to actualgeographic location.假定方格在地图、图表或者照片上根据任意比例分层次建立的表格,其目的是淡化实际地理情况的制约,便于图上对点作业。A ssum ption——A supposition on …     

不同计算方法计算滑坡推力与桩前抗力的比较与分析

不平衡推力法用于计算滑坡推力是可行的,但在计算桩前抗力时,无法考虑桩的变形因素,计算结果偏大,使工程设计偏于不安全.有限元强度折减法用于计算滑坡推力与桩前抗力,遵循桩-土共同作用的原则,计算结果更合理,并可以得到相应的推力与抗力分布.通过分析验证了有限元强度折减法计算抗滑桩的推力与抗力更为可靠.     

固液火箭冲压发动机推力调节的一种方法

推力调节是整体式固液火箭冲压发动机研究的一项关键技术.基于发动机推力调节工作原理,推导了一种推力调节方法,数字仿真结果证明了该方法的可行性.     

Experimental investigation on weak shock wave mitigation characteristics of flexible polyurethane foam and polyurea

In recent years, explosion shock wave has been considered as a signature injury of the current military conflicts. Although strong shock wave is lethal to the human body, weak shock wave can cause many more lasting consequences. To investigate the protection ability and characteristics of flexible materials and structures under weak shock wave loading, the blast wave produced by TNT explosive is loaded on the polyurethane foam with the density of 200.0 kg/m3(F-200) and 400.0 kg/m3(F-400), polyur...     

当代军语快译通

camouflage-The use of natural or artificialmaterial on personnel,objects,or tactical positionswith the aim of confusing,misleading,or evading theenemy.伪装把自然的或人工的材料用于人员、物品或战术位置之上以达到混淆、误导或躲避敌军的目的。c a na lize-To restrict operations to a narrowzone by use of existing or reinforcing obstacles or byfire or bombing.诱逼利用天然或人工障碍物或各种火力将军事行动限制在一个狭长地带。c a rpe t bom bing-The progressivdistribution of a mass bomb load upon an area de…     

燃气流量可调固体火箭冲压发动机飞行性能分析

在建立燃气流量可调固体火箭冲压发动机工作过程仿真模型的基础上,对燃气流量调节过程中发动机飞行性能进行分析.结果表明,在低飞行高度或高飞行马赫数时,发动机有较宽的推力调节范围;随着飞行高度降低或飞行马赫数增加,发动机推力系数降低;随着燃气发生器喷喉面积变小,发动机推力和推力系数增加.     

当代军语快译通

basic e ncyclo pedia——A compilationofidentifiedinstallationsand physicalareas of potentialsignificance as objectivesforattack.Also calledBE.基础大全作为攻击目标而指定的具有潜在意义的设施和物理区域总汇。参见BE。b asic load——(*)The quantityof suppliesrequired to be on hand within,and which can bemoved by,a unit or formation.It is expressedaccording to the wartime organizationof the unitorformationandmaintained attheprescribedlevels.基本负荷要求提供现货并可由部队或信息搬移的补给的数量。它可…     

我校研制出新一代变推力液体火箭发动机

我国新一代变推力液体火箭发动机——SBF—4多次起动、双组元、双调节变推力液体火箭发动机于1991年3月27日在长沙通过了技术鉴定。鉴定委员会由来自全国各有关科研院所和高等院校的十一名专家、教授组成。我国液体火箭发动机领域的技术权威之一,航空航天部11所刘传儒研究员任鉴     

火箭弹道学发动机推力模拟方法

发动机工作性能对火箭飞行性能的严重影响已引起众多研究人员的重视,尤其是火箭发动机推力总冲及其工作时间等重要参数.这里提出了一种在静态测定推力时间历程、总冲的基础上,通过实际飞行测试结果确定其扰动量来最终模拟推力时间历程的仿真方法.该方法简洁方便,易于编制程序及模拟仿真,便于工程人员掌握,可用于火箭发射动力学、外弹道学及射表编制等方面研究,具有一定应用价值.     

Al/Hf ratio-dependent mechanisms of microstructure and mechanical property of nearly fully dense Al—Hf reactive material

This study proposed three types of Al—Hf reactive materials with particle size ratios(a), which were almost completely dense(porosity of <5.40%) owing to their preparation using hot-pressing technology.Microstructure characteristics and phase composition were analyzed, and the influence of particle size ratios on dynamic mechanical behavior and damage mechanism were investigated. The prepared sample with a = 0.1 exhibited continuous wrapping of the Hf phase by the Al phase. Hf—Hf contact(cont...     

Optimization of friction stir welding parameters for improved corrosion resistance of AA2219 aluminum alloy joints

The aluminium alloy AA2219(Al—Cu—Mg alloy) is widely used in the fabrication of lightweight structures with high strength-to-weight ratio and good corrosion resistance.Welding is main fabrication method of AA2219 alloy for manufacturing various engineering components.Friction stir welding(FSW) is a recently developed solid state welding process to overcome the problems encountered in fusion welding.This process uses a non-consumable tool to generate frictional heat on the abutting surfaces.The welding parameters,such as tool pin profile,rotational speed,welding speed and axial force,play major role in determining the microstructure and corrosion resistance of welded joint.The main objective of this work is to develop a mathematical model to predict the corrosion resistance of friction stir welded AA2219 aluminium alloy by incorporating FSW process parameters.In this work a central composite design with four factors and five levels has been used to minimize the experimental conditions.Dynamic polarization testing was carried out to determine critical pitting potential in millivolt,which is a criteria for measuring corrosion resistance and the data was used in model.Further the response surface method(RSM) was used to develop the model.The developed mathematical model was optimized using the simulated annealing algorithm optimizing technique to maximize the corrosion resistance of the friction stir welded AA2219 aluminium alloy joints.     

The Two Techniques of O. Henry''''s

O.Henry is the founder of American modern short story, What makes his stories enjoy most popularity is his own styles——(1)Reasonable artistic exaggreration. (2)Unexpected ending. In this article I emphatically comment its value in the two stories: The Romance of a Busy Broker and The Last Leaf. Up to Now there is still much in Henry's method that we can make use of beneficially.     

你具有哪种职业特质?

你具有哪种职业特质? 1.你要远行，选择乘坐的是什么船? A.海盗船(1分)B.小船(2分) C.木筏(3分) 2.你会选择跟几人同行? A.几十人(l分)B.几个人(2分).C.你独自行动(3分) 3.如果能带动物上船，你会带哪种动物? A.狗(1分)B.猫(2分) C.小鸟(3分)的一刹那，你感觉会看到什么? A.金银珠宝(2分) B.看到未来的魔镜(3分) C.能把你带来的动物变成人类的魔法药(l分)记分: 10至14分—A型;15至19分—B型;20至27分—C型;28至32分—D型;33分—E型。解析:幸呀舀4.你觉得哪种东西会在路途上守护你? A.母亲亲手做的布娃娃(2分) B.父亲送的宝剑(l分) C…     

基于定点剪出法抗滑桩滑坡推力分布形式的确定

针对现有滑坡推力分布假设为三角形、矩形或梯形等不合理现状,提出基于定点剪出假设确定滑坡推力分布的方法。在不平衡推力法的基础上,分析桩身若干点以上潜在滑体稳定性对滑坡推力的影响,然后在相邻段滑坡推力分布为线性的条件下,计算全桩若干点处滑坡推力的分布值。结果表明,定点剪出潜在滑体的稳定性对滑坡推力分布影响较大,若该稳定系数大于工程安全要求时,则无滑坡推力产生,若该稳定系数小于工程安全要求且相邻段稳定系数相差较大时,滑坡推力分布将会产生突变。最后通过一个边坡支护桩滑坡推力分布的工程实例,对该理论分析的合理性进行了说明。且在抗滑桩结构设计中,可根据桩身若干点滑坡推力分布值,采用变截面配筋,以节省工程投资。     

Effects Of Subjective Factors On Second Language Learnig(L2L)

<正>In order to promote the activeness and initiative of learners and allow them to take theirlearning advantages,a teacher should be fully aware of the psychological process and models ofL2L．For no matter how well learners can command a language,their subjective incentives play adecisive role,that is the case particularly for non—Eniglish majors,who are always exposed tocrowded,serious and teacher—centred learning contexts.